Etymology
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Words related to *reudh-

ruddock (n.)

"redbreast, European robin," Middle English ruddoke, from late Old English rudduc, from rudu "red color," related to read "red" (from PIE root *reudh- "red, ruddy") + diminutive suffix -ock.

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ruddy (adj.)

Middle English rudi, from late Old English rudig "reddish, of a red color," of the complexion, "rosy, healthily red," probably from rudu "redness," which is related to read "red" (from PIE root *reudh- "red, ruddy"). As a British slang euphemism for bloody (q.v.), it is recorded by 1914. Related: Ruddiness.

rufous (adj.)

"of a dull red color, reddish-brown," 1781, from Latin rufus "red, reddish, tawny, red-haired," from an Osco-Umbrian cognate of Latin ruber "red" (from PIE root *reudh- "red, ruddy"). Mostly in names or descriptions of birds or other animals; sometimes frowned upon in early use as just a French word for "reddish." Related: Rufulous.

Rufus 

masc. proper name, literally "red-haired," from Latin rufus "red, tawny, red-haired" (see rufous).

russet (n.)

mid-13c., "coarse, woolen cloth," usually of a subdued reddish-brown color; also (early 15c.) the color of this; from Old French rousset, from rosset (adj.) "reddish," diminutive of ros, rous "red," from Latin russus, which is related to ruber "red" (from PIE root *reudh- "red, ruddy").

As an adjective, "reddish," from late 14c. The name continued even when the cloth color was brown or gray. The coarse, homespun cloth also was indicative of rustic homely, simple persons or qualities (by 1580s). The adjective was applied to a type of apples by 1620s; as the name of a variety of eating apple by 1708; as a type of pear by 1725.

rust (n.)

"red oxide of iron, red coating which forms on the surface of iron exposed to the air," Old English rust "rust," in late Old English also figurative, "anything tending to spiritual corrosion, a moral canker," related to rudu "redness," from Proto-Germanic *rusta- (source also of Frisian rust, Old High German and German rost, Middle Dutch ro(e)st), from PIE *reudh-s-to- (source also of Lithuanian rustas "brownish," rūdėti "to rust;" Latin robigo, Old Church Slavonic ruzda "rust"), from suffixed form of root *reudh- "red, ruddy."

As a morbid condition of plants caused by fungal growth, from mid-14c. U.S. colloquial rust-bucket for "old car or boat" is by 1945. Rust Belt "decayed urban industrial areas of mid-central U.S." (1984) was popularized in, if not coined by, Walter Mondale's presidential campaign.

rubefacient (adj.)

"making red, causing redness," 1804, from Latin rubefacientem (nominative rubefaciens), present participle of rubefacere "to make red," from rubeus "red, reddish" (related to ruber, from PIE root *reudh- "red, ruddy") + facere "to make" (from PIE root *dhe- "to set, put"). As a noun, "substance producing redness in the skin," 1805.

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